Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed33c01695b46c5e…

MALICIOUS

PDF

87.1 KB Created: 2021-08-30 21:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ceff36f7928c2cc2186d69d53e2cda1 SHA-1: 070b437462ba8dfd4657237184732a74780301e0 SHA-256: ed33c01695b46c5e5cefb4bb2b200323ca6177ea1887fed446bd31d42d04f320
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The presence of numerous unknown URLs further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffecc3a23f4---kubabiretokazufuso.pdf In PDF document text
    • http://viettranslators.com/webroot/img/files/792870767.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/27225622585.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b87eaf72---xiletasisokutobedes.pdfIn PDF document text
    • http://orderkai.com/uploads/files/98343734417.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/togoluverinadivomunuberij.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/48752202603.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73026054873.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/85514977619.pdfIn PDF document text
    • https://hojoairport.com/images/file/revaxagakewesuzoxixin.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vv9i6m7bl0licutb4vln6pnmuu/38167001857.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/13240036960.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20949959964.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/pimoseloxufolukevupemifo.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/19928475701.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd7b0d2bf2---labuxujijaluzogutul.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/34741307483.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/p61gsod0630eva6ek0u1mjecm4/66084654681.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/26790370234.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/7e247a49f75005e9d57543eec815e5fc/regajobuwagon.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/19f0d4c459afde93be78615a41078a8e/tisunedanesezeri.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210703102410_1347825553.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lagl470h33mvmmspj5fduvcn9q/43059103018.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d9b3f142fed9f630d812e5c5af91ce02/nabavokarofojadiporutebe.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b87a5d1cc---megawogegetojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+plant+flowers+in+minecraftPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 11072 bytes
SHA-256: 6700a9006dca378b4f74f08c442f06db9f1b20fed77e57a8362471d0ba6f8e6a
font_02_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 17564 bytes
SHA-256: 78c20c097c1fe74c6169fc8e5ffe29b5154b2aa1fd766dee96d2bd55d1e80cd6